GFCI wiring

Discussion in 'Electrical Forum discussion & Blog' started by bradleyheathhays, Jun 2, 2014.

  1. bradleyheathhays

    bradleyheathhays New Member

    Joined:
    Jun 2, 2014
    Location:
    95124
    Installed a new Cooper ShockSentry GFCI / DDFT / ICTA outlet in an outlet box that had no ground. White to silver and black to gold, without being grounded will this outlet trip correctly? It'll be handling close to a 10 amp load powering a large aquarium.
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Yes.......
     
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  4. Homeownerinburb

    Homeownerinburb New Member

    Joined:
    Jan 14, 2012
    Location:
    Los Angeles, CA USA
    You are good to go.

    The only problem, and it is not much of one, is that the test requires a ground to shunt a little current from the hot to ground, which you don't have.

    I use a plug in polarity tester that also tests gfis, and it won't test if there is not a ground, for the same reason.

    You have made the outlet infinitely safer by putting in the gfi.
     
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    A GFCI trips when the current on the hot and neutral are different. In a properly working circuit, all of the power that goes into it on the hot lead must return on the neutral. When they get out of balance, that means some has 'faulted' to ground, and it 'interrupts' the circuit (i.e., trips). Most work when that difference exceeds about 0.005A (5ma). It does not need a ground to cause it to trip at the device. Overloading the device will (or at least should) cause the circuit breaker or fuse to shut off power as well - two different things - one is protecting you (or your fish!), and the second is protecting the wiring from overheating.

    THey work. The receptacle should be marked with one of the labels that came with it indicating it does not have a ground wire attached.
     
  6. ActionDave

    ActionDave Electrician

    Joined:
    Feb 4, 2009
    Occupation:
    Electrician
    Location:
    Colorado
    A real good reason if you happen to be pushing the test button and touching a grounded/earthed metal cover plate at the same time.
     
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